Sand bag



E. NESTLER July 5, 1927.

SAND BAG Filed Jul 2, 192a INVENTOR WITNESSES 544d:

ATTORNEYS Patented July 5, 1927.

UNITED STATES g 1,635,094 PATENT, OFFICE.

EMIL NnsrLnR, or NEW YORK, n. Y.

SAND BAG.

. AppIication filed July 2. 1926. Serial No. 120,183.

This invention relates to sand bags and more particularly tosand bagsadapted for use within a tire or shoe to receive pressure and to holdthe tire or shoe in shape when under pressure during the vulcanizingprocess, particularly with relation to the outer portion of the shoe ortire.

I am of course aware that sand bags have been used for the same purpose,such bags being made of fabric or other inelastic woven material, thebag as a whole being straight so that when it is placed within a shoe ortire and pressure applied thereon the inner portion of the bag iswrinkled and the outer portion is subjected to overstretch or unduestrain. Asa result, these bags have a very short life as either thestitching connecting the portions of the bag or the material thereofbreaks due to the pressures.

It is therefore the broad idea of my invention toprovide a bag which hasa natural curve both longitudinally and transversely to conform tothe'interior of the tire or shoe; furthermore, to provide such a bagwith stitching which will permit of expansion or contraction Withoutputting undue strain upon the bag. I

By reason of these two essential elements the bag maintains its naturalposition or shape, the flexible stitching permitting free movement to alarger or smaller radius without buckling or stretching the fabric ofthe bag. When pressure is applied it is always upon the smaller radius,the higher points of the wave pockets receiving the pressure first andtherefore forcing the sand toward the center, thus filling out the sandbag in such a way that no wrinkling or buckling can take place.

A further object is to provide a bag in which the fabric is cut so thatthe weave is bias to the longitudinal axis of the bag, which permitsmaximum of stretching or movement of the material and gives to thematerial a maximum of eificierncy for the purpose intended.

With these and other objects in view, the invention consists in certainnovel features of construction and combinations and arrangements ofparts, which will be more fully hereinafter described and pointed out inthe claims.

In the accompanying drawings Figure 1 is a view in side "elevation,showing my improved bag filled with sand and ready for use;

Figure 2 is a view in cross section, show mg my improved bag inoperative position; Figure 3 1s a view in transverse section of thebag'before it is filled with sand;

Figure 4 is a diagrammatic view, illustrating one manner of cutting thebag members from a sheet of fabric in order to give the desired biasweave to the bag.

A represents my improved bag which is composed of two pieces 1 and 2,preferably of woven fabric of suflicient strength and durability for thepurpose intended. These pieces 1 and 2 are cut in the arc of a circle,and I illustrate in Figure 4 one manner of forming these pieces whichconsists in cutting the same on the line 3 from a sheet 4 in such amanner as to give a bias weave to certain flexibility and movement ofthe threads of the material itself so as to compensate for pressures invarying positions and greatly lengthen the life of the bag.

These two pieces 1 and 2 are flat and have preferably at their outeredges inwardly turned portions 5 secured together by a line of stitching6. The inner portions of the pieces 1 and 2 are secured together by awavy line of stitching 7 which allows for movementof the bag in variousdirections without breaking the stitching. In other words, thisstitching 7 is in a real sense flexible, and the pressure on the bagcausing the material to take various shapes and contours will becompensated for by the wavy line of stitching and the threads will notbreak as they would if the line of stitching is straight.

The ends of the bag are open and when the bag is filled with sand theseends are gathered together and closed by binding cords 8, or othermeans.

In Figure 2 Iillustrate the bag in position in a shoe 9, the latter in amold 10. with a plunger 11 exerting pressure on the bag to maintain theshoe in engagement with the mold. The parts 10 and 11, constituting nopart of the present invention, are illustrated in dot and dash lines.

It isthis broad idea of a curved fabric bag which constitutes the broadidea of my invention, and more specifically the provision of a bag ofthis character having a Wavy line of stitching at its inner portion andthe material of bias Weave which I desire to cover.

Various slight changes and alterations .the material of the strip whichallows for I might be made in the general form of the parts describedWithout departing from my invention and hence I do not limit myself tothe precise details set forth but consider myself at liberty to makesuch slight changes and alterations as fairly fall Within the spirit andscope of the appended claims.

I claim:

1. sand bag of the character described, comprising a casing composed offabric, the sections thereof being connected at the inner portion of thebag by a flexible line of stitching, said casing being curvedlongitudinally in the arc of a circle and adapted to be filled with sandand the like.

2. A sand bag composed of two sections of bias Weave fabric, curved inthe arc of a circle, said sections securedtogether at their inner andouter portions by lines of stitohmg.

EMIL N GSTLER.

